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Ultrapure water production apparatus and ultrapure water production method

A technology for manufacturing equipment and manufacturing methods, which is applied to pure water manufacturing equipment and the field of pure water manufacturing, and achieves the effects of excellent economy, space saving, and miniaturization

Active Publication Date: 2017-02-22
KURITA WATER INDUSTRIES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of installing the decarbonation device in the rear stage of the first RO membrane device, the reduction of the water quality of the treated water is prevented, but in the first RO membrane device and the second RO membrane device, inorganic carbonic acid is concentrated and scale is precipitated

Method used

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  • Ultrapure water production apparatus and ultrapure water production method
  • Ultrapure water production apparatus and ultrapure water production method
  • Ultrapure water production apparatus and ultrapure water production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] pass figure 1 The shown pure water production device produces pure water. However, an activated carbon device is installed in the subsequent stage of the MF membrane device 1 .

[0062] Tap water (M alkali concentration: 50mgCaCO2) was treated by MF membrane device (manufactured by Kuraray (Kurare), hollow fiber type PVDF membrane, pore size: 0.02μm). 3 / L, silica concentration: 30mg / L) to remove turbidity, remove free chlorine through an activated carbon device, and then pass water through the first RO membrane device (manufactured by Nitto Denko, ES20). The permeated water of the first RO membrane device was passed through an electrodeionization device (manufactured by Kurita Industries, Ltd., KCDI-TC) to obtain pure water. The concentrated water of the first RO membrane device is passed through the second RO membrane device (manufactured by Nitto Denko Corporation, ES20), and passed through the membrane degasser (Calgerde) that is arranged on the return line of the...

Embodiment 2

[0070] Table 1 shows the results in the same manner as in Example 1 except that the pH of the feed water of the first RO membrane device was 6.0.

Embodiment 3

[0072]The pH of the feed water of the second RO membrane device was set to 6.0, and the water recovery rate was set to 30% to prevent the precipitation of silica scale. Except this, the same treatment was carried out as in Example 1, and the results were shown in Table 1. middle.

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Abstract

Provided are an ultrapure water production apparatus and ultrapure water production method in an ultrapure water production process configured so that concentrate from a first RO membrane device is processed in a second RO membrane device and permeate is collected. The apparatus and method are advantageous in terms of cost and the decarbonation device for preventing concentration of inorganic carbonic acid in the system is small and space-conserving. The present invention is an ultrapure water production apparatus equipped with: a first RO membrane device (3) for RO membrane treatment of water to be treated; an introduction line (13) for introducing the water to be treated to the first RO membrane device (3); an outflow line (14) for causing permeate from the first RO membrane device (3) to flow out; a second RO membrane device (5) for RO membrane treatment of the concentrate from the first RO membrane device (3); and return lines (19, 20) for returning permeate from the second RO membrane device (5) to the introduction line (13). A decarbonation device (6) for decarbonation of the permeate from the second RO membrane device (5) is provided in the return line.

Description

technical field [0001] The present invention relates to a pure water production device and a pure water production method for producing pure water by treating water to be treated with a water treatment process having a first reverse osmosis membrane device and a device for the first reverse osmosis membrane device A second reverse osmosis membrane unit for concentrated water treatment. Background technique [0002] Pure water production equipment usually consists of a pretreatment turbidity removal device, a decarbonation device, a reverse osmosis membrane (RO membrane) device, an electrodeionization device, and the like. [0003] RO membrane devices can remove organic substances and ions, but basically cannot remove dissolved gases such as carbon dioxide and oxygen. Carbon dioxide turns into bicarbonate ions in water and becomes a burden on the electrodeionization device. Therefore, a decarbonation device is usually installed in the front stage of the RO membrane device to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44B01D61/10B01D61/12B01D61/58C02F9/00
CPCB01D61/10B01D61/12B01D61/58C02F1/44C02F9/00C02F1/441C02F1/4695C02F1/66
Inventor 早川邦洋龟田英邦
Owner KURITA WATER INDUSTRIES LTD
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